[][src]Struct futures::stream::PollFn

#[must_use = "streams do nothing unless polled"]
pub struct PollFn<F> { /* fields omitted */ }
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A stream which adapts a function returning Poll.

Created by the poll_fn function.

Trait Implementations

impl<T, E, F> Stream for PollFn<F> where
    F: FnMut() -> Poll<Option<T>, E>, 
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The type of item this stream will yield on success.

The type of error this stream may generate.

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Attempt to pull out the next value of this stream, returning None if the stream is finished. Read more

Important traits for Wait<S>
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Creates an iterator which blocks the current thread until each item of this stream is resolved. Read more

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Converts this stream into a Future. Read more

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Converts a stream of type T to a stream of type U. Read more

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Converts a stream of error type T to a stream of error type U. Read more

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Filters the values produced by this stream according to the provided predicate. Read more

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Filters the values produced by this stream while simultaneously mapping them to a different type. Read more

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Chain on a computation for when a value is ready, passing the resulting item to the provided closure f. Read more

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Chain on a computation for when a value is ready, passing the successful results to the provided closure f. Read more

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Chain on a computation for when an error happens, passing the erroneous result to the provided closure f. Read more

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Collect all of the values of this stream into a vector, returning a future representing the result of that computation. Read more

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Concatenate all results of a stream into a single extendable destination, returning a future representing the end result. Read more

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Deprecated since 0.1.14

: please use Stream::concat2 instead

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result. Read more

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Execute an accumulating computation over a stream, collecting all the values into one final result. Read more

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Flattens a stream of streams into just one continuous stream. Read more

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Skip elements on this stream while the predicate provided resolves to true. Read more

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Take elements from this stream while the predicate provided resolves to true. Read more

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Runs this stream to completion, executing the provided closure for each element on the stream. Read more

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Map this stream's error to any error implementing From for this stream's Error, returning a new stream. Read more

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Creates a new stream of at most amt items of the underlying stream. Read more

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Creates a new stream which skips amt items of the underlying stream. Read more

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Fuse a stream such that poll will never again be called once it has finished. Read more

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Borrows a stream, rather than consuming it. Read more

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Catches unwinding panics while polling the stream. Read more

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An adaptor for creating a buffered list of pending futures. Read more

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An adaptor for creating a buffered list of pending futures (unordered). Read more

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Deprecated

: functionality provided by select now

An adapter for merging the output of two streams. Read more

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An adapter for zipping two streams together. Read more

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Adapter for chaining two stream. Read more

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Creates a new stream which exposes a peek method. Read more

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An adaptor for chunking up items of the stream inside a vector. Read more

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Creates a stream that selects the next element from either this stream or the provided one, whichever is ready first. Read more

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A future that completes after the given stream has been fully processed into the sink, including flushing. Read more

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Splits this Stream + Sink object into separate Stream and Sink objects. Read more

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Do something with each item of this stream, afterwards passing it on. Read more

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Do something with the error of this stream, afterwards passing it on. Read more

impl<F: Debug> Debug for PollFn<F>
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Formats the value using the given formatter. Read more

Auto Trait Implementations

impl<F> Send for PollFn<F> where
    F: Send

impl<F> Sync for PollFn<F> where
    F: Sync

Blanket Implementations

impl<T> From for T
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

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🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

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🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Immutably borrows from an owned value. Read more

impl<T> BorrowMut for T where
    T: ?Sized
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Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more